Now, I would like to combine a wah & a volume pedal in the same enclosure. Is there a way to do it? I would like to have the volume pedal active at all times and just switch between volume and wah. When bypasing the wah I would like to switch back to volume control.Thanks for all input in advance.

So what's to stop you from wiring up a switch to select between the wah circuit and using the pot as a volume pedal?

The pot is supposed to be 100K. Isn't that a bit too small of a value? I would expect something around 500K. If the 100K value wouldn't cause any loading or other problems I can try to wire it through the wah circuit or as a standalone volume pot.